X wcfs: py: also try fuser in addition to lsof

wcfs/__init__.py

@@ -572,6 +572,16 @@ def _fuse_unmount(mntpt, *optv):
                 log.warn("(lsof failed)")
         defer(_)
 
+        # XXX fuser should work where lsof starts to fail after wcfs going to EIO mode
+        #     ref:ZzO3wtEdQVDw5Wz5@deca.navytux.spb.ru
+        def _():
+            log.warn("# fuser -vmM %s" % mntpt)
+            ret, out = _sysproccallout(["fuser", "-vmM", mntpt])
+            log.warn(out)
+            if ret:
+                log.warn("(fuser failed)")
+        defer(_)
+
         out = out.rstrip() # kill trailing \n\n
         opts = ' '.join(optv)
         if opts != '':